[Dev][Python] Unused python scripts under python/scripts

[raulcd]

Describe the bug, including details regarding any error messages, version, and platform.

We have two scripts under python/scripts which doesn't seem used nor documented:

https://github.com/apache/arrow/blob/0e9e32fc231a81552fac4818ab7c671ca04dabec/python/scripts/test_leak.py
and
https://github.com/apache/arrow/blob/0e9e32fc231a81552fac4818ab7c671ca04dabec/python/scripts/test_imports.py

I think test_imports.py can be removed. test_leak.py can potentially be useful as a snippet on how to check for possible leaks but if we want to keep it we should probably document it.

Component(s)

Developer Tools, Python

[raulcd]

@pitrou @AlenkaF those seem to be related to some ancient tests and are isolated from our test structure. Do you know if those are used or are useful to keep?

[pitrou]

I would probably remove them.

[raulcd]

@GujaLomsadze can you add a comment here so the issue can be assigned to you. If you don't add a comment the assign job fails :)

[GujaLomsadze]

take